GILROY — Police announced Wednesday that a man found dead in his home earlier this week was the victim of a homicide, and they are seeking two women who reportedly used his credit card at an East San Jose minimart following the death.

Police were called about 3 a.m. Monday to a home on Bay Tree Drive after a neighbor”s dogs were barking loudly toward the home, seemingly indicating something was awry, Gilroy police Sgt. Pedro Espinoza said.

When officers entered the home they found an unconscious man who was later pronounced dead at the scene. He has since been identified as the homeowner, 56-year-old Robert Joseph Heiser.

Police initially treated Heiser”s death as only suspicious because there were no obvious signs of foul play. But an autopsy revealed blunt-force trauma that was not visible at a glance, prompting investigators to declare the case a homicide, Espinoza said.

Heiser was last seen alive Sunday night, leading police to believe he was killed sometime overnight into Monday. Espinoza said there were not obvious signs of forced entry found at the home.

No suspects have been identified, but police are looking for two women they consider “persons of interest.” The pair was recorded on surveillance video at a convenience store on White Road in East San Jose, where they reportedly used Heiser”s credit card later Monday morning.

The death marks Gilroy”s first homicide of 2015; two were recorded in 2014.

Anyone with information about the case can contact Gilroy police Detective Eric Cryar at 408-846-0350 or leave an anonymous tip at 408-846-0330.